JP3674716B2 - Fire extinguishing nozzle - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fire-extinguishing nozzle used in a fire-extinguishing apparatus in a place where a fire-out position is limited to some extent, such as an engine room such as a large bus.
[0002]
[Prior art]
Conventionally, halon gas has been used for extinguishing engine room fires in large buses, but in line with halon regulations, fire extinguishing devices have been demanded.
Fires in the engine room often catch fire when light oil leaking from fuel pipe joints, fuel pipe cracks or corrosion holes touches the hot parts of the engine, and the fire is extinguished because the fuel is light oil. It is possible with agents.
[0003]
Therefore, when a conventional spray nozzle is used as a water-based fire-extinguishing agent discharge nozzle, the spray pattern is conical, and thus the side wall portion directly beside the nozzle cannot be covered. On the other hand, when a normal fire extinguishing sprinkler head is used, the fire extinguishing liquid is excessively sprayed on the side wall portion on the opposite side, and the lower part of the nozzle that should be covered (the front face of the nozzle) becomes thin. This is because the fire extinguishing sprinkler head is a nozzle designed to spray water evenly from the ceiling to the floor in a circular fashion. It is not designed to do. In order to spray water almost evenly on the floor surface, it is necessary to spray a large amount of water in a ring shape on the surrounding floor, so that a large amount of water will come out from the water discharge hole next to the nozzle that is in the distance (periphery). Is designed. For example, as seen in the closed sprinkler head disclosed in Japanese Patent Application Laid-Open No. 54-34597, the nozzle hole is formed in a slit shape from the bottom wall to the peripheral wall of the bowl-shaped cover member. The edges are all the same height when viewed from the side of the peripheral wall, so this watering distribution will be sprinkled in a donut shape with respect to the floor surface, and water will be evenly distributed from the floor surface to the side wall. Not.
Moreover, even if it is going to respond | correspond with a some nozzle, while unnecessary redundant dispersion | spreading of a fire extinguishing liquid is inevitable, the structure of a fire extinguishing apparatus will become complicated.
[0004]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to obtain a nozzle suitable for extinguishing a place where the fire position is limited to a certain extent, such as an engine room, so that an aqueous fire extinguishing agent can be efficiently sprayed. It is to be.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a fire-extinguishing nozzle according to the present invention has a nozzle body, a plurality of nozzle holes drilled in a slit shape from a bottom wall to a peripheral wall, and a nozzle cover attached to the nozzle body. In the fire extinguishing nozzle,
Among the heights from the bottom wall inner surface of the upper end edges of the plurality of nozzle holes, the height of at least one nozzle hole is made different from the height of the other nozzle holes .
[0006]
Preferably, the height of the upper end edge of the nozzle hole from the inner surface of the bottom wall has a regular height, and the length of the lower end edge of the nozzle hole from the inner surface of the peripheral wall is the height of the upper end edge. Correspondingly, it is characterized by a regular short length. That is, for nozzle holes with a high upper edge, the length from the lower edge to the inner surface of the peripheral wall is shortened, and for nozzle holes with a lower upper edge, the length from the lower edge to the inner surface of the peripheral wall is increased. Nozzle holes are drilled in a regular relationship. For example, two types of nozzle holes are alternately arranged in the nozzle cover, and the vertically long hole portion in the peripheral wall of the first nozzle hole is made longer than the vertically long hole portion in the peripheral wall of the second nozzle hole. The horizontally long hole portion in the bottom wall is made shorter than the horizontally long hole portion in the bottom wall of the second nozzle hole.
[0007]
More preferably, a protrusion having a function of a deflector for changing the vertical water flow to the horizontal radial direction is provided at the center of the bottom wall of the nozzle cover, and the height of the protrusion is lower than the highest upper edge of the nozzle hole. And the periphery of the protrusion is configured to be inside the longest lower end edge of the nozzle hole. Moreover, it is preferable that this protrusion is detachable from the nozzle cover.
[0008]
[Action]
In the fire extinguishing nozzle of the present invention, the height of the upper end edge of the nozzle hole formed in the slit shape in the nozzle cover is made different, so that the amount is larger than necessary toward the side of the nozzle like a conventional sprinkler head. Water is not sprinkled and fire extinguishing liquid is not wasted.
[0009]
Each nozzle hole shortens the length from the lower edge of the bottom wall to the inner surface of the peripheral wall when the height of the upper edge of the peripheral wall is high, and the bottom wall when the height of the upper edge of the peripheral wall is low Is placed in a regular relationship that increases the length from the lower edge to the inner surface of the peripheral wall. Many spray from the hole toward the bottom (front) of the nozzle. Therefore, by adjusting the dimensions of the two types of nozzle holes, it is possible to easily obtain a nozzle having a simple structure and a good distribution balance or having a necessary distribution.
[0010]
By providing a protrusion with a flat upper surface in the center of the bottom wall of the nozzle cover, when the jet from the nozzle outlet of the nozzle body collides with the flat upper surface of the protrusion, it is bent in the radial direction and the protrusion is flat. After flowing along the surface, it scatters right next to the nozzle through a vertically long hole having an upper end edge higher than the protrusion. Therefore, since the jet tends to flow along the flat surface of the protrusion, the range in the radial direction (the range that scatters directly to the nozzle) is extended.
In addition, since the peripheral edge of the protrusion is inside the longest long hole portion of the nozzle hole, negative pressure is generated at the corner formed by the peripheral edge of the protrusion and the bottom wall portion, along the flat surface of the protrusion. The flow that has flowed is pulled downward and sprayed toward the lower side (front side) of the nozzle through the long horizontal hole.
By providing the protrusion having such a deflector function, the fire-extinguishing liquid can be widely dispersed from the side to the bottom of the nozzle, so that a nozzle having a simple structure and a good distribution balance can be obtained.
[0011]
【Example】
1 is a side view of a fire extinguishing nozzle according to an embodiment of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG.
In this embodiment, a nozzle body 1, a nozzle cover 2 screwed to the nozzle body 1, and a deflector 3 provided at the center of the bottom wall of the nozzle cover 2 are configured.
[0012]
The nozzle body 1 is perforated with a fire-extinguishing liquid jet 11 as a center, and an internal thread portion 13 for coupling to the nozzle cover 2 is provided on the inner peripheral surface of the enlarged diameter portion 12. The nozzle body 1 is screw-connected to a fire extinguishing liquid supply pipe (not shown) and a male screw portion 14, and a spanner hooking portion 15 is formed on the outer peripheral portion of the enlarged diameter portion 12.
[0013]
The nozzle cover 2 is formed of a bottomed cylindrical body having a bottom wall 21 and a peripheral wall 22, and a plurality of nozzle holes 4, 5 drilled in a slit shape from the bottom wall 21 to the peripheral wall 22 has an upper end edge 41. The high 1st nozzle hole 4 and the 2nd nozzle hole 5 with the low upper end edge 51 become the structure arrange | positioned alternately. That is, as shown in an enlarged view in FIG. 4, the length of the vertically elongated hole 43 of the first nozzle hole 4, that is, the height H _{1 of the} upper edge 41 from the bottom wall inner surface 23, and the second nozzle hole The length of the vertically elongated hole 53, that is, the height H _{2 of the} upper edge 51 from the bottom wall inner surface 23 is made different. Further, the length of the horizontally elongated hole 44 of the first nozzle hole 4, that is, the length a ₁ from the lower end edge 42 to the peripheral wall inner surface 24, and the length of the horizontally elongated hole 54 of the second nozzle hole 5, that is, The length a ₂ from the lower edge 52 to the inner surface 24 of the peripheral wall is as follows, that is, for the first nozzle hole 4 having a high height H ₁ , the length a ₁ of the laterally long hole 44 is set. The second nozzle hole 5 that is shortened and has a low height H ₂ is formed in a correspondence relationship in which the length a ₂ of the laterally elongated hole portion 54 is increased.
The nozzle cover 2 also includes a male screw portion 25 that is coupled to the female screw portion 13 of the nozzle body 1, a flange portion 26 that is used when the nozzle cover 2 is screw-coupled, and a female screw portion 27 that is used to screw-couple the deflector 3. .
[0014]
The deflector 3 has a protrusion 31 installed at the center of the bottom wall 21 of the nozzle cover 2 and a male screw part 32 coupled to the female screw part 27 of the bottom wall 21. The protrusion 31 is a circular flat plate, and its upper surface 33 is a flat surface. Further, as shown in FIG. 4, the height t of the protrusion 31 is set lower than the upper end edge 41 of the highest vertical hole 43, and the peripheral edge 34 of the protrusion 31 is the longest horizontal hole 54. It is made to be located further inside than the lower end edge 52. Therefore, in FIG. 4, the distance b ₁ between the lower end edge 42 of the shorter laterally long hole portion 44 and the peripheral edge 34 of the protrusion 31 is equal to the lower end edge 52 of the longer laterally long hole portion 54 and the peripheral edge 34 of the protrusion 31. greater than the distance b _2. Apparently, a ₁ + b ₁ = a ₂ + b ₂ . As can be seen from FIG. 4, the protrusion 31 can be formed integrally on the bottom wall 21 of the nozzle cover 2.
[0015]
Next, the operation of the fire extinguishing nozzle of the present embodiment configured as described above will be described with reference to FIGS. FIG. 5 shows that the fire extinguishing liquid is sprayed toward the side of the nozzle, FIG. 6 shows that the fire extinguishing liquid is sprayed toward the lower side (front side) of the nozzle, and FIG. 7 shows the flow at the corner 35 of the protrusion 31. It is a figure explaining the pulling action of.
[0016]
As shown in FIG. 5, when extinguishing an engine room fire, a water-based fire extinguisher pumped from a chemical tank via a fire extinguishing liquid supply pipe (both not shown), that is, water, a strengthening liquid, a foam fire extinguishing liquid, etc. The fire-extinguishing liquid jet W ₁ collides perpendicularly with the deflector 3 inside the nozzle cover 2 through the jet port 11 of the nozzle body 1. Since the upper surface 33 of the protrusion 31 of the deflector 3 is a flat surface, the jet W ₁ is bent in the radial direction by collision (W ₂ ), and further flows along the flat surface 33 of the protrusion 31 (W ₃ ). , And discharged from a large number of first and second nozzle holes 4 and 5. In this case, since it is going to flow along the flat surface 33, the flow W ₄ passing through the vertically long hole 43 higher than the protrusion 31 scatters just beside the nozzle and has a radial range (on the nozzle). Extend the range that scatters to the side). The flow through the vertically elongated hole 53 that is lower than that disperses the fire extinguishing liquid in an oblique direction with respect to the nozzle (FIG. 6).
On the other hand, as shown in FIGS. 6 and 7, the flow W ₅ along the flat surface 33 generates negative pressure at the corner 35 formed by the peripheral edge 34 of the protrusion 31 and the bottom wall 21. It is pulled downward by a negative pressure (W ₆ ) and scatters (W ₇ ) through the longest horizontal elongated hole 54 to the lower part (front face) of the nozzle. The flow through the horizontally elongated hole 44 that is shorter than that is scattered obliquely downward (FIG. 5).
Accordingly, the fire extinguishing liquid can be sprayed widely and evenly from the side to the bottom of the nozzle, so that one nozzle can be used in places where the fire position is limited to a certain extent, for example, from the side wall to the bottom of a narrow space such as an engine room. Can be covered.
[0017]
In FIG. 4, the relationship between the nozzle spray pattern and the dimensions of the nozzle holes 4 and 5 is as follows.
t small, H ₁ large, a ₁ small, if b ₁ large, distant spread to just beside direction of the nozzle increases. If H _{2 is} small, a _{2 is} large, and b _{2 is} small, downward spraying in the front direction of the nozzle increases. In this way, by adjusting the size of each part of the two types of nozzle holes 4 and 5, it is possible to easily obtain a nozzle having a good distribution balance or a nozzle having a necessary distribution.
[0018]
In the present embodiment, the deflector 3 is configured to be detachable from the nozzle cover 2 as shown in FIG. 3, so that it has various distributions by simply replacing the deflector 3 with one having a different height. It is possible to easily switch to the nozzle. Further, the deflector 3 does not necessarily have to be fixed to the nozzle cover 2 with screws (32, 27), and may be configured to be mounted by fitting a shaft and a hole.
[0019]
In the present invention, the number of nozzle holes is not limited to two, and may be three or more. For example, the length of the vertically long hole portion may be decreased stepwise, and the length of the horizontally long hole portion may be correspondingly increased stepwise. The shape of the upper edge and the lower edge may be any shape such as a square or an arc.
The shape of the nozzle cover may be a bottomed cylindrical shape, and may be any shape such as a polygonal column shape, a bowl shape, or a truncated cone shape.
The peripheral edge of the protrusion is formed at a right angle to the bottom wall, but may be an obtuse angle or an acute angle.
Although the nozzle is shown as an open type, it may be a closed type slender head.
In the above-described embodiment, a case has been described in which fire extinguishing can be efficiently performed at a place where the fire-out place is specified to some extent, such as the engine room of a bus.
By the way, if the height of the upper end edge of the nozzle hole of the fire-extinguishing nozzle is arranged so as to be high, low, low and high, the fire extinguishing liquid can be sprayed more in the central portion and less in the peripheral portion. Moreover, if the height of the upper edge is arranged so as to be high, low, high and low, the fire extinguishing liquid can be sprayed with a large amount in the peripheral portion and a small amount in the central portion.
Therefore, by changing the arrangement of the nozzle holes in accordance with the fire extinguishing conditions in the specific place, it is possible to easily obtain the optimum spraying state suitable for each specific place not only in the engine room but also in other places.
[0020]
【The invention's effect】
As described above, according to the present invention, since the height of the upper end edge of the nozzle hole in the peripheral wall portion of the nozzle cover is made different, it is possible to limit the amount of spraying in the lateral direction of the nozzle and It can be widely spread from the front to the side. Therefore, it is possible to cover a wide area from the side wall to the bottom surface even in a place where the fire position is limited to some extent, for example, a place such as an engine room, and an efficient fire extinguishing nozzle can be obtained.
[0021]
In particular, the length of the horizontally long hole in the bottom wall is shortened for nozzle holes with a high top edge, and the length of the horizontally long hole is short for a nozzle hole with a low top edge. Since a plurality of types of nozzle holes are arranged in a regular correspondence relationship of increasing the length, it is possible to easily obtain a nozzle having a good distribution balance or a necessary distribution.
[0022]
In addition, by providing a protrusion having a deflector function at the center of the bottom wall of the nozzle cover, it is possible to extend the range of the nozzle in the lateral direction and to freely change the spray amount and angle below the nozzle. is there.
[Brief description of the drawings]
FIG. 1 is a side view of a fire extinguishing nozzle according to an embodiment of the present invention.
FIG. 2 is a bottom view of FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged sectional view of a main part of the present invention.
FIG. 5 is an explanatory diagram showing the operation of the first nozzle hole.
FIG. 6 is an explanatory view showing the operation of the second nozzle hole.
FIG. 7 is an explanatory diagram showing the operation of a protrusion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Nozzle cover 3 Deflector 4 1st nozzle hole 5 2nd nozzle hole 21 Bottom wall 22 of a nozzle cover Nozzle cover peripheral wall 23 Bottom wall inner surface 24 Peripheral wall inner surface 31 Projection 33 Projection upper surface 34 Projection Perimeter 41 Upper edge 42 of the first nozzle hole Lower edge 43 of the first nozzle hole 43 Long hole part 44 of the first nozzle hole Horizontally long hole part 51 of the first nozzle hole 52 Upper edge 52 of the second nozzle hole The lower end edge 53 of the second nozzle hole 53 The vertically long hole portion 54 of the second nozzle hole The horizontally long hole portion of the second nozzle hole

Claims (5)

In the fire extinguishing nozzle having a nozzle body and a plurality of nozzle holes drilled in a slit shape from the bottom wall to the peripheral wall, and having a nozzle cover attached to the nozzle body,
The fire-extinguishing nozzle , wherein the height of at least one nozzle hole differs from the height of the other nozzle holes among the heights from the bottom wall inner surface of the upper end edges of the plurality of nozzle holes.   The height of the upper end edge of the nozzle hole from the inner surface of the bottom wall has a regular height, and the length of the lower end edge of the nozzle hole from the inner surface of the peripheral wall corresponds to the height of the upper end edge. The fire-extinguishing nozzle according to claim 1, wherein the fire-extinguishing nozzle has a regular short length.   Two types of the nozzle holes are alternately arranged in the nozzle cover, and the first nozzle hole has a vertically long hole portion in the peripheral wall longer than the vertically long hole portion in the peripheral wall of the second nozzle hole. The fire-extinguishing nozzle according to claim 1, wherein a horizontally long hole portion in the bottom wall of the hole is shorter than a horizontally long hole portion in the bottom wall of the second nozzle hole.   The nozzle cover has a protrusion having a flat upper surface at the center of the bottom wall, the height of the protrusion being lower than the highest upper edge of the nozzle hole, and the periphery of the protrusion is the nozzle hole The fire-extinguishing nozzle according to claim 1, wherein the fire-extinguishing nozzle is located on the inner side of the longest lower end edge.   The fire-extinguishing nozzle according to claim 4, wherein the protrusion is configured to be detachable from the nozzle cover.

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